We study quantum enhancement of sensitivity and bandwidth using squeezed light in a multi-parameter quantum sensor, the hybrid rf-dc optically pumped magnetometer (hOPM) [1]. Using a single-spin ensemble, the hOPM acquires both the dc field strength (scalar magnetometry) and resonantly detects one quadrature of the magnetic field at a programmed frequency (rf magnetometry). In contrast to...
The nuclear spin of Helium-3 atoms in a room-temperature gas is a very well isolated
quantum system featuring record-long coherence times of up to several days. It is used
in a variety of applications ranging from magnetometry and gyroscopes to magnetic
resonance imaging and precision tests of fundamental physics. While the exceptional
isolation of Helium-3 nuclear spins ensures long...
High-precision control of magnetic fields is critical for the operation of a range of quantum technologies. For example, optically pumped magnetometers (OPMs) utilise electromagnetic conductor networks within sensor housings to generate zero-field environments and modulation or bias fields. Current-carrying systems are also used within magnetically shielded rooms for hybrid active-passive...
The Fermilab Muon g-2 Experiment measures the precession frequency of the muon spin relative to its momentum in a 50m circumference storage ring with a 1.45T vertical field and quadrupole electric fields. The magnetic-moment anomaly a$_\mu=(g_\mu-2)/2$ is determined from this anomalous precession frequency and precision determination of the magnetic field over space and time using a...
Self-compensated comagnetometers, employing overlapping samples of spin-polarized alkali and noble gases are promising sensors for exotic beyond-the-standard-model fields and high-precision metrology such as rotation sensing.
We use comagnetometers to perform an Axion-like particle (ALP) dark matter search. We search through the ALP-nucleon interaction by interfering the signals of two...
Self-compensating noble-gas–alkali-metal comagnetometers are highly sensitive to spin-dependent perturbations, making them useful tools for both inertial sensing and precision searches for physics beyond the Standard Model. To optimize these sensors for long-term measurements, required for such applications, we address two key challenges: robust calibration and long-term operational stability....
